Estimating 3D Variation in Active-Layer Thickness Beneath Arctic Streams Using Ground-Penetrating Radar

We acquired three-dimensional (3D) ground-penetrating radar (GPR) data across three stream sites on the North Slope, AK, in August 2005, to investigate the dependence of thaw depth on channel morphology. Data were migrated with mean velocities derived from multi-offset GPR profiles collected across...

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Bibliographic Details
Published in:Journal of Hydrology
Main Authors: Brosten, Troy R., Bradford, John H., McNamara, James P., Gooseff, Michael N., Zarnetske, Jay P., Bowden, William B., Johnston, Morgan E.
Format: Text
Language:unknown
Published: ScholarWorks 2009
Subjects:
3D ground-penetrating radar
permafrost
thaw bulb
Arctic streams
hyporheic
Geosciences
Earth Sciences
Geophysics and Seismology
Active layer thickness
Arctic
Online Access:https://scholarworks.boisestate.edu/cgiss_facpubs/64
https://doi.org/10.1016/j.jhydrol.2009.05.011
Description
Summary:We acquired three-dimensional (3D) ground-penetrating radar (GPR) data across three stream sites on the North Slope, AK, in August 2005, to investigate the dependence of thaw depth on channel morphology. Data were migrated with mean velocities derived from multi-offset GPR profiles collected across a stream section within each of the 3D survey areas. GPR data interpretations from the alluvial-lined stream site illustrate greater thaw depths beneath riffle and gravel bar features relative to neighboring pool features. The peat-lined stream sites indicate the opposite; greater thaw depths beneath pools and shallower thaw beneath the connecting runs. Results provide detailed 3D geometry of active-layer thaw depths that can support hydrological studies seeking to quantify transport and biogeochemical processes that occur within the hyporheic zone.

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